﻿using System;
using System.Diagnostics;
using System.Globalization;
using System.Runtime.InteropServices;
using EnvDTE;
using EnvDTE80;
using Microsoft.VisualStudio;
using Microsoft.VisualStudio.Shell;
using Microsoft.VisualStudio.Shell.Interop;

namespace PeterKuhn.SilverlightDebugHelper
{
    /// <summary>
    /// This is the class that implements the package exposed by this assembly.
    ///
    /// The minimum requirement for a class to be considered a valid package for Visual Studio
    /// is to implement the IVsPackage interface and register itself with the shell.
    /// This package uses the helper classes defined inside the Managed Package Framework (MPF)
    /// to do it: it derives from the Package class that provides the implementation of the 
    /// IVsPackage interface and uses the registration attributes defined in the framework to 
    /// register itself and its components with the shell.
    /// </summary>
    // This attribute tells the PkgDef creation utility (CreatePkgDef.exe) that this class is
    // a package.
    [PackageRegistration(UseManagedResourcesOnly = true)]
    // This attribute is used to register the informations needed to show the this package
    // in the Help/About dialog of Visual Studio.
    [InstalledProductRegistration("#110", "#112", "1.0", IconResourceID = 400)]
    [Guid(Constants.GuidSilverlightDebugHelperPkgString)]
    [ProvideAutoLoad(VSConstants.UICONTEXT.SolutionExists_string)]
    public sealed class SilverlightDebugHelperPackage : Package
    {
        private Settings _settings;
        private ProcessHelper _processHelper;
        private DebuggerEvents _debuggerEvents;

        /// <summary>
        /// Default constructor of the package.
        /// Inside this method you can place any initialization code that does not require 
        /// any Visual Studio service because at this point the package object is created but 
        /// not sited yet inside Visual Studio environment. The place to do all the other 
        /// initialization is the Initialize method.
        /// </summary>
        public SilverlightDebugHelperPackage()
        {
            Trace.WriteLine(string.Format(CultureInfo.CurrentCulture, "Entering constructor for: {0}", this.ToString()));
        }

        #region Package Members

        /// <summary>
        /// Initialization of the package; this method is called right after the package is sited, so this is the place
        /// where you can put all the initilaization code that rely on services provided by VisualStudio.
        /// </summary>
        protected override void Initialize()
        {
            Trace.WriteLine(string.Format(CultureInfo.CurrentCulture, "Entering Initialize() of: {0}", this.ToString()));
            base.Initialize();

            var dte2 = GetService(typeof(SDTE)) as DTE2;
            if (dte2 == null)
            {
                return;
            }

            // initialize settings and helper classes, hook events
            _settings = Settings.Load();
            _processHelper = new ProcessHelper(_settings);
            _processHelper.Initialize(this);
            _debuggerEvents = dte2.Events.DebuggerEvents;
            _debuggerEvents.OnEnterRunMode += DebuggerEvents_OnEnterRunMode;
        }

        protected override void Dispose(bool disposing)
        {
            // be nice and clean up event handlers and references
            if (_debuggerEvents != null)
            {
                _debuggerEvents.OnEnterRunMode -= DebuggerEvents_OnEnterRunMode;
                _debuggerEvents = null;
            }

            base.Dispose(disposing);
        }

        #endregion

        private void DebuggerEvents_OnEnterRunMode(dbgEventReason reason)
        {
            // try to attach in certain cases
            if (reason == dbgEventReason.dbgEventReasonAttachProgram || reason == dbgEventReason.dbgEventReasonLaunchProgram)
            {
                if (_processHelper != null)
                {
                    _processHelper.TryAttachToProcesses();
                }
            }
        }

    }
}
